Home / 1,221.35-1,831.16-571.73

Finding the Fourth Proportional to 1,221.35, 1,831.16 and 571.73

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Solution

The fourth proportional to 1,221.35, 1,831.16 and 571.73 is: 857.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.35 : 1,831.16 = 571.73 : x
  2. Step 2: Convert to fraction form
    1,221.35/1,831.16 = 571.73/x
  3. Step 3: Cross multiply
    1,221.35x = 1,831.16 × 571.73
  4. Step 4: Simplify right side
    1,221.35x = 1,046,930.83
  5. Step 5: Solve for x
    x = 1,046,930.83/1,221.35
  6. Step 6: Final answer
    x = 857.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.